Cygwin Ruby and $LOAD_PATH

[Steven Penny <svnpenn at gmail dot com>]

Cygwin Ruby $LOAD_PATH is under "/usr":

   $ ruby -e 'puts $LOAD_PATH' | sort
   /usr/lib/ruby/2.3.0
   /usr/lib/ruby/vendor_ruby/2.3.0
   /usr/local/lib/ruby/site_ruby/2.3.0
   /usr/local/share/ruby/site_ruby
   /usr/share/gems/gems/did_you_mean-1.0.2/lib
   /usr/share/ruby/2.3.0
   /usr/share/ruby/vendor_ruby
   /usr/share/rubygems

but Gems get installed to "/home":

   $ gem install org-ruby coderay
   $ gem which org-ruby coderay
   /home/Steven/.gem/ruby/2.3.0/gems/org-ruby-0.9.12/lib/org-ruby.rb
   /home/Steven/.gem/ruby/2.3.0/gems/coderay-1.1.2/lib/coderay.rb

This causes the Gems to not be found:

   $ cat alpha.org
   #+BEGIN_SRC rust
   fn main() {
     println!("alpha beta");
   }
   #+END_SRC

   $ org-ruby -d alpha.org
   Exception `LoadError' at
   /usr/local/share/ruby/site_ruby/rubygems/core_ext/kernel_require.rb:54 -
   cannot load such file -- coderay


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